Caos theme uses WordPress REST API for AJAX post load.
The premium version of the theme also provides AJAX comments, and the ability to upload an image as a logo, use sidebar, footer menu, color settings and other options.
Caos theme hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress. New themes are always being added, so visit the homepage to see what’s new.